Monday marks a particularly special day in Boston as the 120th Boston Marathon will be held throughout the city.

This has become even more emotional since the bombing attacks from 2013 transformed the event from an exhibition of human fitness to an expression of human indomitability.

Mark Wahlberg is making a movie about those tragic events, titled Patriots Day.

On Saturday, the Ted star decided to take some time away from filming to stop by the Revere Hotel Boston to visit the 68 members of the Spaulding Rehabilitation Hospital's Race for Rehab team to give an inspiring speech!

Part of what makes this so cool is not only is Spaulding Rehab the location where 32 bombing survivors were treated following the tragedy, but there are three survivors on the current team — Heather Abbott, Roseanne Sdoia, and police officer Dic Donohue.

Mark showed up in a blue sweatshirt, his Red Sox baseball hat, and some blue jeans as he addressed the small group saying:

Alex Wolff, best known for his work onNickelodeon with The Naked Brothers Band and other FAR more light-hearted work, has been now confirmed to be attached to a new project about the two Boston Marathon bombers.

In the new flick, which is called Patriots Day and will be out in December, Wolff is set to portray Dzhokhar Tsarnaev, the younger of the two brothers who bombed the Boston Marathon back in 2013.

Three people were killed in that horrific attack, with more than 250 others injured, many severely.

Of course, Dzhokhar survived the incident and aftermath only to be taken into custody after hiding in a boat in the backyard of a home, though his older brother and co-conspirator Tamerlan was killed in a shootout with police soon after the bombing.

In July, father John McCain was diagnosed with stage 4 glioblastoma, an aggressive form of brain cancer, which also claimed Beau's life.

When the 33-year-old began crying, the politician went over and consoled her, adding:

"There is hope... And if anybody can make it, your dad [can]."

Biden is also optimistic about "breakthroughs that are occurring now," regarding potential treatment options and cures.

"There's a lot of things happening. Any of you who have somebody who is diagnosed with gliobastoma, which is about as bad as it gets, there's breakthroughs that are occurring now... And it can happen tomorrow."